/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.solr.response.transform;

import java.util.HashMap;
import java.util.Map;

import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.util.plugin.NamedListInitializedPlugin;

/**
 * New instance for each request
 * 
 * 
 */
public abstract class TransformerFactory implements NamedListInitializedPlugin {
	protected String defaultUserArgs = null;

	public void init(NamedList args) {
		defaultUserArgs = (String) args.get("args");
	}

	public abstract DocTransformer create(String field, SolrParams params,
			SolrQueryRequest req);

	public static final Map<String, TransformerFactory> defaultFactories = new HashMap<String, TransformerFactory>();
	static {
		defaultFactories.put("explain", new ExplainAugmenterFactory());
		defaultFactories.put("value", new ValueAugmenterFactory());
		defaultFactories.put("docid", new DocIdAugmenterFactory());
		defaultFactories.put("shard", new ShardAugmenterFactory());
	}
}
